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Onyx Boox Tab Ultra Review | 68 Data compared

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  • Avg. price in UK: ~£530
  • Avg. price in US: ~$600
  • Screen size: 10.3 inches
  • Battery life: 23 hours
  • Supported bookstore ecosystem: Android Open Ecosystem

Onyx Boox Tab Ultra review. Compare 68 technical specifications and user reviews to see how it ranks among ereaders and if it is worth buying.

8.0

Overall score

What it is: An overall evaluation of the eReader's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best eReaders on the market.

Score components:

90.0%

8.2

Technical Score

10.0%

6.7

User score

Excellent
8.2

Technical Score

What it is: An assessment of the eReader's technical performance, covering key areas such as display quality, reading features, battery life, format support, ecosystem, and design.

When it matters: When you want to compare eReaders based on technical performance and available features.

Score components:

25.0%

8.3

Display

22.0%

9.9

Reading

18.0%

7.1

Battery

14.0%

9.6

Hardware

12.0%

8.7

Connectivity

9.0%

3.0

Design

Excellent
6.7

User score

What it is: A rating that combines user reviews and the total number of reviews received by the eReader.

When it matters: When you want to know how an eReader feels in daily reading and how reliable it is for screen comfort, battery life, and library management according to user feedback.

Score components:

70.0%

7.5

User reviews

30.0%

4.7

Popularity

User score:
United Kingdom
amazon
3.8
(100)
amazon
3.5
(10)
amazon
3.6
(9)

(Reviews last updated: Apr 2026)

Good
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    Best prices in UK

    Best rankings

    ?

    Available: ranking among products currently available (including other versions of this product).
    All: ranking among all products in the database.

    Verdict

    The Onyx Boox Tab Ultra is a high-performance 10.3-inch E Ink tablet designed for productivity, featuring a 227 DPI Carta glass screen and powered by a Qualcomm octa-core processor with 4GB of RAM and 128GB of internal storage (expandable via microSD). Running on Android 11 with full Google Play Store access, it distinguishes itself with Boox Super Refresh technology for smooth screen transitions, a 16MP rear camera for document scanning, and a massive 6,300mAh battery. Main pros include its versatile software ecosystem, a built-in fingerprint sensor for security, and a professional unibody design that supports an optional magnetic keyboard. However, its notable cons include a heavy 480g weight that can cause wrist fatigue during one-handed use, tinny dual speakers, and a camera that often produces dark or shadowed scans compared to modern smartphones.

    Technical Specifications of eReader Onyx Boox Tab Ultra

    Technical Score

    What it is: An assessment of the eReader's technical performance, covering key areas such as display quality, reading features, battery life, format support, ecosystem, and design.

    When it matters: When you want to compare eReaders based on technical performance and available features.

    Score components:

    25.0%

    8.3

    Display

    22.0%

    9.9

    Reading

    18.0%

    7.1

    Battery

    14.0%

    9.6

    Hardware

    12.0%

    8.7

    Connectivity

    9.0%

    3.0

    Design

    8.2
    Onyx Boox Tab Ultra has a technical score of 8.19 points, which is higher than that of 91.8% of products in this category.
    User score

    What it is: A rating that combines user reviews and the total number of reviews received by the eReader.

    When it matters: When you want to know how an eReader feels in daily reading and how reliable it is for screen comfort, battery life, and library management according to user feedback.

    Score components:

    70.0%

    7.5

    User reviews

    30.0%

    4.7

    Popularity

    User score:
    United Kingdom
    amazon
    3.8
    (100)
    amazon
    3.5
    (10)
    amazon
    3.6
    (9)

    (Reviews last updated: Apr 2026)

    6.7
    Onyx Boox Tab Ultra has a user score of 6.68 points, which is lower than that of 85.3% of products in this category.
    Popularity
    What it is: An indicator based on the number of reviews received by the eReader.
    When it matters: When you prefer to choose an eReader reviewed and selected by many other buyers.
    4.7
    Onyx Boox Tab Ultra has a popularity of 4.7 points, which is lower than 51.6% of smartphones.
    Ratio quality/price

    What it is: An indicator that combines the eReader's overall rating with its cost.

    When it matters: When you are looking for an eReader with a good balance between reading comfort, features, and price.

    Score components:

    60.0%

    8.0

    Overall score

    40.0%

    7.7

    Price

    7.9
    Onyx Boox Tab Ultra has a quality-to-price ratio of 7.9 points, which is higher than 66.4% of smartphones.
    Brand name
    What it is: Identifies the company or ecosystem behind the device, which often shapes the store, software approach, and accessory support.
    When it matters: When you are choosing between Kindle, Kobo, Boox, PocketBook, or another ecosystem with different store access and software behavior.

    Importance: MEDIUM

    Onyx
    Screen size
    What it is: The diagonal measurement of the reading panel, usually given in inches.
    When it matters: When you are deciding between a small travel reader and a larger page that works better for PDFs, comics, or textbooks.

    Importance: HIGH

    Good value: >=7.8

    10.3 inches
    Onyx Boox Tab Ultra has a screen size of 10.3 inches which is larger than 86.9% of eReaders on this spec and equal to 11.5% of eReaders.
    Screen resolution
    What it is: The total pixel grid shown on the panel, normally written as width by height.
    When it matters: When small fonts, diagrams, or dense page layouts need to stay readable without constant zooming.

    Importance: HIGH

    1404x1872 px
    Onyx Boox Tab Ultra uses a screen resolution of 1404x1872 px, which is sharper than that of 73.8% of eReaders and the same as that of 17.2% of eReaders.
    Pixel density
    What it is: The number of pixels packed into each inch of the display, expressed in ppi.
    When it matters: When you want text edges to look cleaner and serif fonts to resemble print more closely.

    Importance: HIGH

    Good value: >=300

    227 ppi
    Onyx Boox Tab Ultra has a pixel density of 227 ppi which is lower than 51.6% of eReaders on this spec and equal to 7.4% of eReaders.
    E-paper display
    What it is: Uses an electrophoretic panel designed to mimic paper rather than a conventional backlit phone or tablet screen.
    When it matters: When you read for long stretches and want lower glare and less screen-like fatigue than on LCD or OLED devices.

    Importance: LOW

    yes
    Onyx Boox Tab Ultra uses an e-paper display. 97.6% of eReaders have an e-paper display.
    Show more
    Supported file types
    What it is: Lists which ebook, document, image, or audio formats the reader can open without conversion.
    When it matters: When your library comes from mixed sources instead of one locked bookstore.

    Importance: HIGH

    24
    Onyx Boox Tab Ultra supports 24 file types which is more than 84% of eReaders on this spec and equal to 6% of eReaders.
    PDF reflow support
    What it is: Can rearrange PDF text into a more readable, screen-sized layout instead of forcing the original fixed page.
    When it matters: When you read A4 documents, articles, or manuals on a smaller eReader screen.

    Importance: HIGH

    yes
    Onyx Boox Tab Ultra offers PDF reflow. 55.4% of eReaders support PDF reflow.
    Annotation support
    What it is: Allows highlighting, handwritten notes, typed comments, or markup directly inside supported files.
    When it matters: When you study, review academic papers, or want your notes to stay attached to the exact passage.

    Importance: HIGH

    yes
    Onyx Boox Tab Ultra offers annotation support. 100% of eReaders offer annotation support.
    Dictionary
    What it is: Provides built-in word lookup while you read.
    When it matters: When you read in another language or want quick definitions without leaving the page.

    Importance: MEDIUM

    yes
    Onyx Boox Tab Ultra includes a built-in dictionary. 99.2% of eReaders include a built-in dictionary.
    Text-to-speech
    What it is: Converts on-screen text into spoken audio using a synthetic voice.
    When it matters: When you want to keep following a book while resting your eyes, walking, or multitasking.

    Importance: MEDIUM

    yes
    Onyx Boox Tab Ultra offers text-to-speech. 64.2% of eReaders include text-to-speech.
    Show more
    Battery life
    What it is: Estimates how long the device can keep running between charges under normal reading conditions.
    When it matters: When you travel, commute, or want to finish books for days without thinking about charging.

    Importance: HIGH

    Good value: >=30

    23 hours
    Onyx Boox Tab Ultra offers 23 hours of battery life which is longer than 53.8% of eReaders on this spec and equal to 1.3% of eReaders.
    Battery capacity
    What it is: The amount of energy the battery can store, commonly expressed in mAh.
    When it matters: When you want a rough hardware indicator of how much power reserve the device has.

    Importance: MEDIUM

    Good value: >=2000

    6,300 mAh
    Onyx Boox Tab Ultra has a battery capacity of 6300 mAh which is higher than 98.3% of eReaders on this spec and equal to 1.7% of eReaders.
    Charging time
    What it is: The approximate time needed to recharge the battery from low to full.
    When it matters: When you often top up shortly before leaving and need the reader ready again quickly.

    Importance: MEDIUM

    Good value: <=3

    2 hours
    Onyx Boox Tab Ultra takes 2 hours to charge which is quicker than 49% of eReaders on this spec and equal to 40.4% of eReaders.
    Supports USB-C fast charging, a 20-minute charge can add around 25% battery
    Wireless charging
    What it is: Can recharge on a compatible charging pad without plugging in a cable.
    When it matters: When you prefer drop-and-charge convenience on a desk or bedside stand.

    Importance: LOW

    no
    Onyx Boox Tab Ultra does not offer wireless charging. 7.3% of eReaders offer wireless charging.
    Internal storage
    What it is: The built-in space available for books, notes, audiobooks, apps, and downloaded documents.
    When it matters: When you keep large libraries offline or store a lot of PDFs and audio locally.

    Importance: HIGH

    Good value: >=32

    128 GB
    Onyx Boox Tab Ultra offers 128 GB of internal storage which is more than 94.1% of eReaders on this spec and equal to 5.9% of eReaders.
    RAM capacity
    What it is: The amount of working memory used for page rendering, multitasking, and keeping content active in the background.
    When it matters: When you open heavy files, switch between books, or expect the interface to stay snappy.

    Importance: MEDIUM

    Good value: >=2

    4 GB
    Onyx Boox Tab Ultra offers 4 GB of RAM which is more than 86.6% of eReaders on this spec and equal to 10.1% of eReaders.
    CPU base clock speed
    What it is: The baseline operating frequency of the main processor under normal load.
    When it matters: When you compare readers for faster menu navigation, indexing, and handling of larger documents.

    Importance: MEDIUM

    8 x 2 GHz
    Onyx Boox Tab Ultra has a CPU base clock speed of 8 x 2 GHz, which is faster than that of 82.6% of eReaders and the same as that of 12.4% of eReaders.
    Operating system
    What it is: The software platform that drives the interface, reading apps, and deeper system capabilities.
    When it matters: When you care about app availability, customization, and how flexible the device can become beyond basic reading.

    Importance: HIGH

    Android 11
    Onyx Boox Tab Ultra runs Android 11, which is more advanced than that of 76.2% of eReaders and the same as that of 17.2% of eReaders.
    Android 11
    Memory card slot
    What it is: Accepts removable storage so the library can expand beyond the built-in capacity.
    When it matters: When your collection will outgrow internal storage or you move files between devices manually.

    Importance: MEDIUM

    yes
    Onyx Boox Tab Ultra has a memory card slot. 43.1% of eReaders have a memory card slot.
    Show more
    Wi-Fi connectivity
    What it is: Connects the reader to wireless networks for book downloads, syncing, updates, and online services.
    When it matters: When you buy books directly on the device or keep your library synced without using a cable.

    Importance: HIGH

    yes
    Onyx Boox Tab Ultra connects over Wi-Fi. 93.5% of eReaders have Wi-Fi.
    Wi-Fi version
    What it is: Specifies which wireless networking standard is supported, such as Wi-Fi 4, 5, or 6.
    When it matters: When router compatibility, wireless stability, or faster transfers on newer home networks matter to you.

    Importance: LOW

    Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n)
    Onyx Boox Tab Ultra supports Wi-Fi Wi-Fi 5 (802.11ac), Wi-Fi 4 (802.11n), which is newer than that of 58.2% of eReaders and the same as that of 40.2% of eReaders.
    Wi-Fi bands supported
    What it is: Shows whether the reader can use 2.4 GHz, 5 GHz, or both wireless bands.
    When it matters: When crowded apartment Wi-Fi or 5 GHz-only setups make band support matter at home or in the office.

    Importance: LOW

    2.4 GHz+5 GHz
    Onyx Boox Tab Ultra supports 2.4 GHz+5 GHz Wi-Fi bands, which is broader than that of 57.4% of eReaders and the same as that of 42.6% of eReaders.
    Bluetooth
    What it is: Provides short-range wireless pairing for headphones, speakers, keyboards, page turners, or other accessories.
    When it matters: When you listen to audiobooks, use a remote page turner, or want cable-free accessories around the house.

    Importance: MEDIUM

    yes
    Onyx Boox Tab Ultra connects over Bluetooth. 60.2% of eReaders have Bluetooth.
    Bluetooth can pair wireless accessories.
    Bluetooth version
    What it is: Identifies the supported Bluetooth generation, which affects efficiency, codec support, and compatibility.
    When it matters: When you pair newer headphones and want a more stable, lower-power wireless connection.

    Importance: LOW

    Good value: >=5.0

    5.0
    Onyx Boox Tab Ultra supports Bluetooth 5.0 which is newer than 58.5% of eReaders on this spec and equal to 28.8% of eReaders.
    Show more
    Weight
    What it is: The mass of the device, usually measured in grams.
    When it matters: When one-handed comfort matters and you do not want the reader to feel tiring during long sessions.

    Importance: HIGH

    Good value: <=200

    480 g
    Onyx Boox Tab Ultra weighs 480 g which is heavier than 90.2% of eReaders on this spec and equal to 0.8% of eReaders.
    Thickness
    What it is: The depth of the body from front to back, usually measured in millimetres.
    When it matters: When grip comfort, sleeve fit, or how slim the reader feels in the hand matters to you.

    Importance: MEDIUM

    Good value: <=8

    6.7 mm
    Onyx Boox Tab Ultra is 6.7 mm thick which is thinner than 82.5% of eReaders on this spec and equal to 0.8% of eReaders.
    Height
    What it is: The vertical size of the body, usually measured from top to bottom in millimetres.
    When it matters: When you are checking whether the reader will fit a bag, jacket pocket, or small stand.

    Importance: LOW

    Good value: <=160

    225 mm
    Onyx Boox Tab Ultra is 225 mm tall which is taller than 77.1% of eReaders on this spec and equal to 0.8% of eReaders.
    Width
    What it is: The side-to-side body measurement, usually given in millimetres.
    When it matters: When one-handed reach and how much space the reader takes in a bag or bedside setup matter.

    Importance: LOW

    Good value: <=130

    184.5 mm
    Onyx Boox Tab Ultra is 184.5 mm wide which is wider than 84.4% of eReaders on this spec and equal to 0.8% of eReaders.
    Water resistance (splashproof)
    What it is: Can tolerate light splashes, damp hands, or brief accidental contact with water.
    When it matters: When you read by the bath, at the pool, or outdoors where light moisture is realistic.

    Importance: MEDIUM

    no
    Onyx Boox Tab Ultra does not have water resistance against splashes. 25% of eReaders have water resistance against splashes.
    Show more

    Onyx Boox Tab Ultra vs the average eReader

    • 4.12x larger battery capacity
      Onyx Boox Tab Ultra has a larger battery than the average eReader (6,300 mAh vs 1,530 mAh). The average eReader battery has a capacity of 1,530 mAh.
      What it is: The amount of energy the battery can store, commonly expressed in mAh.
      When it matters: When you want a rough hardware indicator of how much power reserve the device has.

      Importance: MEDIUM

      Good value: >=2000

      Onyx Boox Tab Ultra has a larger battery than the average eReader (6,300 mAh vs 1,530 mAh). The average eReader battery has a capacity of 1,530 mAh.6,300 mAh vs 1,530 mAh
    • 3.3 inches larger screen size
      Onyx Boox Tab Ultra has a larger screen than the average eReader (10.3 inches vs 7 inches). The average eReader screen size is 7 inches.
      What it is: The diagonal measurement of the reading panel, usually given in inches.
      When it matters: When you are deciding between a small travel reader and a larger page that works better for PDFs, comics, or textbooks.

      Importance: HIGH

      Good value: >=7.8

      Onyx Boox Tab Ultra has a larger screen than the average eReader (10.3 inches vs 7 inches). The average eReader screen size is 7 inches.10.3 inches vs 7 inches
    • 8x more storage
      Onyx Boox Tab Ultra offers more internal storage than the average eReader (128 GB vs 16 GB). The average eReader provides 16 GB of internal storage.
      What it is: The built-in space available for books, notes, audiobooks, apps, and downloaded documents.
      When it matters: When you keep large libraries offline or store a lot of PDFs and audio locally.

      Importance: HIGH

      Good value: >=32

      Onyx Boox Tab Ultra offers more internal storage than the average eReader (128 GB vs 16 GB). The average eReader provides 16 GB of internal storage.128 GB vs 16 GB
    • 9 broader file support
      Onyx Boox Tab Ultra supports a broader range of file types than the average eReader (24 vs 15).
      What it is: Lists which ebook, document, image, or audio formats the reader can open without conversion.
      When it matters: When your library comes from mixed sources instead of one locked bookstore.

      Importance: HIGH

      Onyx Boox Tab Ultra supports a broader range of file types than the average eReader (24 vs 15).24 vs 15
    • Supports handwriting recognition
      Onyx Boox Tab Ultra supports handwriting recognition, while the average eReader does not.
      Built-in handwriting-to-text support.
      What it is: Can convert handwritten pen input into editable digital text.
      When it matters: When you write notes by hand and want them searchable, cleaner, or easier to export later.

      Importance: MEDIUM

      Onyx Boox Tab Ultra supports handwriting recognition, while the average eReader does not.
    • 3.49 GB more RAM
      Onyx Boox Tab Ultra has more RAM than the average eReader (4 GB vs 0.512 GB). The average eReader has 0.512 GB of RAM.
      What it is: The amount of working memory used for page rendering, multitasking, and keeping content active in the background.
      When it matters: When you open heavy files, switch between books, or expect the interface to stay snappy.

      Importance: MEDIUM

      Good value: >=2

      Onyx Boox Tab Ultra has more RAM than the average eReader (4 GB vs 0.512 GB). The average eReader has 0.512 GB of RAM.4 GB vs 0.512 GB
    • Includes memory card slot
      Onyx Boox Tab Ultra includes a memory card slot, while the average eReader does not.
      What it is: Accepts removable storage so the library can expand beyond the built-in capacity.
      When it matters: When your collection will outgrow internal storage or you move files between devices manually.

      Importance: MEDIUM

      Onyx Boox Tab Ultra includes a memory card slot, while the average eReader does not.
    • Faster CPU base clock speed
      Onyx Boox Tab Ultra has a faster CPU base clock speed than the average eReader (8x2 GHz vs 1x1 GHz). The average eReader has a CPU base clock speed of 1x1 GHz.
      What it is: The baseline operating frequency of the main processor under normal load.
      When it matters: When you compare readers for faster menu navigation, indexing, and handling of larger documents.

      Importance: MEDIUM

      Onyx Boox Tab Ultra has a faster CPU base clock speed than the average eReader (8x2 GHz vs 1x1 GHz). The average eReader has a CPU base clock speed of 1x1 GHz.8x2 GHz vs 1x1 GHz
    • 3.3 inches larger screen size
      Onyx Boox Tab Ultra has a larger screen than the average eReader (10.3 inches vs 7 inches). The average eReader screen size is 7 inches.
    • 31 more front-light LEDs
      Onyx Boox Tab Ultra has more front-light LEDs than the average eReader (36 vs 5). The average eReader has 5 front-light LEDs.
    • Higher screen resolution
      Onyx Boox Tab Ultra supports higher screen resolution than the average eReader (1404x1872 px vs 1072x1448 px). The average eReader supports 1072x1448 px screen resolution.
    • Has auto-brightness sensor
      Onyx Boox Tab Ultra has an auto-brightness sensor, while the average eReader does not.
    • Supports auto-rotate
      Onyx Boox Tab Ultra supports auto-rotate, while the average eReader does not.
    • 9 broader file support
      Onyx Boox Tab Ultra supports a broader range of file types than the average eReader (24 vs 15).
    • Supports handwriting recognition
      Onyx Boox Tab Ultra supports handwriting recognition, while the average eReader does not.
    • Supports stylus
      Onyx Boox Tab Ultra supports a stylus, while the average eReader does not.
    • Broader library support
      Onyx Boox Tab Ultra supports more library lending platforms than the average eReader (OverDrive, Libby, Hoopla, BorrowBox vs OverDrive, Libby).
    • Includes stylus
      Onyx Boox Tab Ultra includes a stylus, while the average eReader does not.
    • 4.12x larger battery capacity
      Onyx Boox Tab Ultra has a larger battery than the average eReader (6,300 mAh vs 1,530 mAh). The average eReader battery has a capacity of 1,530 mAh.
    • 2 hours longer battery life
      Onyx Boox Tab Ultra offers longer battery life than the average eReader (23 hours vs 21 hours). The average eReader offers 21 hours of battery life.
    • 8x more storage
      Onyx Boox Tab Ultra offers more internal storage than the average eReader (128 GB vs 16 GB). The average eReader provides 16 GB of internal storage.
    • Includes memory card slot
      Onyx Boox Tab Ultra includes a memory card slot, while the average eReader does not.
    • 3.49 GB more RAM
      Onyx Boox Tab Ultra has more RAM than the average eReader (4 GB vs 0.512 GB). The average eReader has 0.512 GB of RAM.
    • Faster CPU base clock speed
      Onyx Boox Tab Ultra has a faster CPU base clock speed than the average eReader (8x2 GHz vs 1x1 GHz). The average eReader has a CPU base clock speed of 1x1 GHz.
    • More advanced operating system
      Onyx Boox Tab Ultra uses Android 11, a more advanced operating system than Kindle OS on the average eReader.
    • Has accelerometer
      Onyx Boox Tab Ultra has an accelerometer, while the average eReader does not.
    • Has fingerprint scanner
      Onyx Boox Tab Ultra has a fingerprint scanner, while the average eReader does not.
    • Has microphone
      Onyx Boox Tab Ultra has a microphone, while the average eReader does not.
    • Supports USB OTG
      Onyx Boox Tab Ultra supports USB OTG, while the average eReader does not.
    • 2 more speakers
      Onyx Boox Tab Ultra has more speakers than the average eReader (2 vs 0). The average eReader has 0 speakers.
    • Better Wi-Fi bands
      Onyx Boox Tab Ultra supports 2.4 GHz+5 GHz Wi-Fi bands, while the average eReader supports 2.4 GHz.
    • 1.4 mm thinner
      Onyx Boox Tab Ultra is thinner than the average eReader (6.7 mm vs 8.1 mm). The average eReader thickness is 8.1 mm.

    Total
    Display
    Reading
    Battery
    Hardware
    Connectivity
    Design
    • Less advanced E-Ink technology
      Onyx Boox Tab Ultra uses Carta E-Ink technology, while the average eReader uses Carta Plus.
    • 14.3% lower pixel density
      Onyx Boox Tab Ultra has a lower pixel density than the average eReader (227 ppi vs 265 ppi). The average eReader has a pixel density of 265 ppi.
    • Older Bluetooth version
      Onyx Boox Tab Ultra supports an older Bluetooth version than the average eReader (5 vs 5.1).
    • 2.25x heavier
      Onyx Boox Tab Ultra is heavier than the average eReader (480 g vs 213 g). The average eReader weighs 213 g.
    • 56.9 mm wider
      Onyx Boox Tab Ultra is wider than the average eReader (184.5 mm vs 127.6 mm). The average eReader width is 127.6 mm.
    • 52 mm taller
      Onyx Boox Tab Ultra is taller than the average eReader (225 mm vs 173 mm). The average eReader height is 173 mm.
    • 2.25x heavier
      Onyx Boox Tab Ultra is heavier than the average eReader (480 g vs 213 g). The average eReader weighs 213 g.
      What it is: The mass of the device, usually measured in grams.
      When it matters: When one-handed comfort matters and you do not want the reader to feel tiring during long sessions.

      Importance: HIGH

      Good value: <=200

      Onyx Boox Tab Ultra is heavier than the average eReader (480 g vs 213 g). The average eReader weighs 213 g.480 g vs 213 g
    • Less advanced E-Ink technology
      Onyx Boox Tab Ultra uses Carta E-Ink technology, while the average eReader uses Carta Plus.
      What it is: States which E Ink generation or panel family the device uses, such as Carta or Kaleido.
      When it matters: When you compare newer and older readers for contrast, refresh behavior, or color performance.

      Importance: HIGH

      Onyx Boox Tab Ultra uses Carta E-Ink technology, while the average eReader uses Carta Plus.Carta vs Carta Plus
    • 14.3% lower pixel density
      Onyx Boox Tab Ultra has a lower pixel density than the average eReader (227 ppi vs 265 ppi). The average eReader has a pixel density of 265 ppi.
      What it is: The number of pixels packed into each inch of the display, expressed in ppi.
      When it matters: When you want text edges to look cleaner and serif fonts to resemble print more closely.

      Importance: HIGH

      Good value: >=300

      Onyx Boox Tab Ultra has a lower pixel density than the average eReader (227 ppi vs 265 ppi). The average eReader has a pixel density of 265 ppi.227 ppi vs 265 ppi
    • 56.9 mm wider
      Onyx Boox Tab Ultra is wider than the average eReader (184.5 mm vs 127.6 mm). The average eReader width is 127.6 mm.
      What it is: The side-to-side body measurement, usually given in millimetres.
      When it matters: When one-handed reach and how much space the reader takes in a bag or bedside setup matter.

      Importance: LOW

      Good value: <=130

      Onyx Boox Tab Ultra is wider than the average eReader (184.5 mm vs 127.6 mm). The average eReader width is 127.6 mm.184.5 mm vs 127.6 mm
    • 3.12x more expensive
      Onyx Boox Tab Ultra is more expensive than the average eReader (£530 vs £170).
      Onyx Boox Tab Ultra is more expensive than the average eReader (£530 vs £170).£530 vs £170
    • 52 mm taller
      Onyx Boox Tab Ultra is taller than the average eReader (225 mm vs 173 mm). The average eReader height is 173 mm.
      What it is: The vertical size of the body, usually measured from top to bottom in millimetres.
      When it matters: When you are checking whether the reader will fit a bag, jacket pocket, or small stand.

      Importance: LOW

      Good value: <=160

      Onyx Boox Tab Ultra is taller than the average eReader (225 mm vs 173 mm). The average eReader height is 173 mm.225 mm vs 173 mm
    • 19.8% lower user score
      Onyx Boox Tab Ultra has a lower user score than the average eReader (6.68 vs 8,000).
      What it is: A rating that combines user reviews and the total number of reviews received by the eReader.
      When it matters: When you want to know how an eReader feels in daily reading and how reliable it is for screen comfort, battery life, and library management according to user feedback.
      Onyx Boox Tab Ultra has a lower user score than the average eReader (6.68 vs 8,000).6.68 vs 8
    • Older Bluetooth version
      Onyx Boox Tab Ultra supports an older Bluetooth version than the average eReader (5 vs 5.1).
      What it is: Identifies the supported Bluetooth generation, which affects efficiency, codec support, and compatibility.
      When it matters: When you pair newer headphones and want a more stable, lower-power wireless connection.

      Importance: LOW

      Good value: >=5.0

      Onyx Boox Tab Ultra supports an older Bluetooth version than the average eReader (5 vs 5.1).5.0 vs 5.1
    Total
    Overall
    Display
    Connectivity
    Design

    Graphic comparison of Onyx Boox Tab Ultra and other eReaders

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    Third-party reviews

    United Kingdom
    amazon
    3.8
    100 Reviews
    amazon
    3.5
    10 Reviews
    amazon
    3.6
    9 Reviews

    (Reviews last updated: Apr 2026)

    What customers like about Onyx Boox Tab Ultra?

    • Full access to the Google Play Store allows for extensive third-party app support beyond standard ereaders.
    • Exceptional refresh rates for an E Ink device, featuring multiple modes like 'Ultrafast' that even allow for basic video playback.
    • Versatile productivity features including a responsive stylus for note-taking and support for a dedicated magnetic keyboard cover.
    • Robust build quality with a premium metal chassis and a built-in fingerprint scanner for added security.
    • Large 10.3-inch display is excellent for reading PDFs and comics, providing a comfortable, eye-friendly experience.
    • Significantly better battery life than traditional LCD tablets, often lasting over a week with light usage.

    What customers dislike about Onyx Boox Tab Ultra?

    • Considerably heavier (approx. 480g) than competitors like the reMarkable 2, making one-handed use tiring over time.
    • The 16MP rear camera bump prevents the device from laying flat on surfaces and is often described as poor for document scanning.
    • The E Ink screen lacks the vibrant colors and high refresh speeds of an iPad, leading to a 'clunky' experience for web browsing or media.
    • Battery drains much faster than standard ereaders (like Kindles) when using 'Super Refresh' technology or Wi-Fi.
    • Software experience can be inconsistent, with some Android apps not scaling well or showing ghosting on the monochrome display.
    • Steep learning curve due to complex menus and a lack of clear documentation for some settings.

    Expert reviews

    M
    medium.com
    13/12/2022
    First week with Onyx Boox Tab Ultra Would you like me to find accessories like the magnetic keyboard cover or specific stylus alternatives for this mo...

    Kiran Adimatyam’s review highlights the Onyx Boox Tab Ultra as a versatile E Ink device bridging the gap between e-readers and tablets, suitable for note-taking, reading, and productivity. Key pros include a comfortable, flicker-free screen for long sessions, Android app compatibility, and excellent stylus functionality, making it a solid tool for "second brain" workflows. However,...Read more

    T
    trustedreviews.com
    08/05/2023
    Onyx Boox Tab Ultra Review - Trusted Reviews

    The Onyx Boox Tab Ultra is a 10.3-inch E Ink tablet featuring Boox Super Refresh technology, delivering high-performance responsiveness that minimizes ghosting and allows for smooth video playback. It operates on Android 11, providing full Google Play Store access, and includes a 16MP rear camera for document scanning with OCR capabilities. Key strengths include a premium, slim...Read more

    T
    techradar.com
    03/03/2023
    Onyx Boox Tab Ultra review: an E Ink peg in an iPad hole - TechRadar

    The Onyx Boox Tab Ultra is a 10.3-inch E Ink tablet running full Android 11 with Google Play access, featuring a 16MP camera for document scanning, a Qualcomm chipset, and 4GB of RAM. Its primary pros include excellent battery life, a high-quality stylus for natural writing, and an optional magnetic keyboard for enhanced productivity. However, cons include the screen’s inability to...Read more

    T
    thesweetsetup.com
    06/02/2023
    A Mindfulness Monday Review of the Onyx Boox Tab Ultra

    The Sweet Setup reviews the Onyx Boox Tab Ultra as a versatile, Android-based e-ink tablet designed for power users, functioning as a "10.3-inch iPad with an e-ink screen" that enables deep integration with apps like Obsidian and Readwise Reader. Key pros include the robust Notes app with layer support and advanced OCR, excellent battery life lasting about a week, and a responsive,...Read more

    A
    androidcentral.com
    05/09/2023
    Onyx Boox Tab Ultra review - Android Central

    The Onyx Boox Tab Ultra is a 10.3-inch E Ink tablet featuring Android 11 with Google Play Store access, a 16MP camera for document scanning, and a highly responsive stylus for note-taking. Its "Super Refresh Technology" and dedicated GPU allow for improved usability in web browsing and app usage compared to traditional E Ink devices. Pros include exceptional battery life and a...Read more

    T
    tagesanzeiger.ch
    21/03/2023
    Boox Tab Ultra Review: Better Battery, More Comfortable Reading

    The Tages-Anzeiger review evaluates the TCL Nxtpaper 14, highlighting its Nxtpaper 3.0 technology and matte, textured display as superior to the iPad for reducing eye strain and glare during reading, especially outdoors. Key advantages include a large 14.3-inch screen, a specialized "ink paper" mode, and a 10,000 mAh battery that outperforms standard iPads in endurance. Conversely,...Read more

    (Translated)Show original
    D
    derbund.ch
    21/03/2023
    Better than the iPad? Boox Tab Ultra Review

    The Onyx Boox Tab Ultra is a 10.3-inch E Ink tablet featuring Boox Super Refresh (BSR) technology and Android, allowing for smooth navigation and app functionality. It boasts a high-performance octa-core processor, a responsive stylus for note-taking, and long-lasting battery life. However, reviewers note the device is heavy, has a poor 16MP camera, and requires software tuning,...Read more

    (Translated)Show original
    Z
    zdnet.fr
    25/04/2024
    Onyx Boox Tab Ultra: The Best E-Ink Tablet for Note-Taking

    The Onyx Boox Tab Ultra is a 10.3-inch E Ink tablet designed for productivity, featuring specialized BOOX Super Refresh technology, a GPU for improved responsiveness, and a 16MP camera for document scanning with OCR capabilities. Key advantages include full access to the Google Play Store for apps like Obsidian and Docs, a natural writing experience with the included stylus, and a...Read more

    (Translated)Show original
    T
    tomshw.it
    03/05/2023
    Onyx Boox Tab Ultra Review: The E-Ink Tablet That Feels Like a PC

    The Onyx Boox Tab Ultra is reviewed by Tom's Hardware Italy as a high-performance 10.3-inch E Ink Carta 1200 tablet running Android 11, designed to bridge the gap between e-readers and productivity devices. Key strengths include the proprietary BOOX Super Refresh technology, which offers superior screen responsiveness for an E Ink device, alongside a 16MP camera, a responsive 6,300...Read more

    (Translated)Show original
    T
    tweakers.net
    18/03/2026
    Comparing Boox e-readers - Tweakers

    Tweakers reviews characterize Onyx Boox devices as versatile Android-based e-ink tablets rather than traditional, locked-down e-readers. They feature an open ecosystem with Google Play Store access, high-quality 300 PPI displays on models like the Boox Go 10.3 and Note Air4 C, and, in some cases, physical page-turn buttons and microSD slots for superior flexibility. However, the...Read more

    (Translated)Show original

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